Re: [Xen-devel] RFC: Superpage/hugepage performance improvement

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 06/04/2010 10:29, "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx> wrote:

>> To make this work I added two mmuext ops, one to mark a superpage and
>> one to unmark it.  This change makes a huge performance difference in
>> the hugepage mapping (on the order of 50 times faster).
> 
> Plus, presumably, some noticeable difference on a macro benchmark. (I
> expect that's the case but I've been wrong before.)

It's a very good question since we might expect that hugetlbfs users
construct long-lived mappings.

 -- Keir



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